n^2-12n-7=0

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Solution for n^2-12n-7=0 equation:


Simplifying
n2 + -12n + -7 = 0

Reorder the terms:
-7 + -12n + n2 = 0

Solving
-7 + -12n + n2 = 0

Solving for variable 'n'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -12n + 7 + n2 = 0 + 7

Reorder the terms:
-7 + 7 + -12n + n2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -12n + n2 = 0 + 7
-12n + n2 = 0 + 7

Combine like terms: 0 + 7 = 7
-12n + n2 = 7

The n term is -12n.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12n + 36 + n2 = 7 + 36

Reorder the terms:
36 + -12n + n2 = 7 + 36

Combine like terms: 7 + 36 = 43
36 + -12n + n2 = 43

Factor a perfect square on the left side:
(n + -6)(n + -6) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(n + -6) equal to 6.557438524 and -6.557438524.

Subproblem 1

n + -6 = 6.557438524 Simplifying n + -6 = 6.557438524 Reorder the terms: -6 + n = 6.557438524 Solving -6 + n = 6.557438524 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + n = 6.557438524 + 6 Combine like terms: -6 + 6 = 0 0 + n = 6.557438524 + 6 n = 6.557438524 + 6 Combine like terms: 6.557438524 + 6 = 12.557438524 n = 12.557438524 Simplifying n = 12.557438524

Subproblem 2

n + -6 = -6.557438524 Simplifying n + -6 = -6.557438524 Reorder the terms: -6 + n = -6.557438524 Solving -6 + n = -6.557438524 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + n = -6.557438524 + 6 Combine like terms: -6 + 6 = 0 0 + n = -6.557438524 + 6 n = -6.557438524 + 6 Combine like terms: -6.557438524 + 6 = -0.557438524 n = -0.557438524 Simplifying n = -0.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. n = {12.557438524, -0.557438524}

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